Experimental study of trabecular vertebral bone mechanical charact

The results of a study of the mechanical characteristics of the spongy bone of the vertebrae of preschool children are presented, as well as the calculation of the maximum allowable contra-ception load during surgical correction of congenital scoliotic deformity for a particular patient. The study included fragments of bodies removed during operations to correct congenital sco-liotic deformities of the semi-vertebrae from the 9th thoracic to the 3rd lumbar. As a result, 19 samples were prepared for the study. The average value of the effective modulus of elasticity for all samples was 26,9 ± 11,8 MPa. The total sample was divided into two clusters by the clustering method devel-oped by the authors. The average value of the effective modulus of elasticity for the first cluster was 32,1 ± 12,0 MPa, for the second 25,0 ± 8,5 MPa. Regression dependencies were constructed for each cluster, which made it possible to calculate the effective modulus of elasticity using Houns-field units. The obtained regression dependences made it possible to calculate the mechanical charac-teristics for the vertebrae of a particular patient, for whom numerical modeling of the process of loading a segment of the spine with contractile forces applied by the doctor during surgery to cor-rect scoliotic deformity was performed. It was shown that with all the loads considered, damage (or "gouging") of the spongy bone of the bodies of both the lower and upper vertebrae is possible. In the roots of the arches of the upper vertebrae, the maximum stresses can be reached with a load of more than 7 kg. In the roots of the arches of the lower vertebrae, a critical load that causes stresses above the tensile strength can be considered a load of more than 16 kg. Such a patient-oriented approach in preoperative planning makes it possible to reduce the risk of complications in the short-term postoperative period.